Sayyiduna Tariq bin Shihab says: The first person who delivered the sermon before the prayer was Marwan. A man stood up and said: O Marwan! You have opposed the Sunnah. He said: O Abu so-and-so! Those matters have been left behind. Sayyiduna Abu Sa'id Khudri (may Allah be pleased with him) said: This man has fulfilled his responsibility. I heard the Messenger of Allah (peace and blessings be upon him) say: Whoever among you sees an evil, let him change it with his hand; if he is not able to do so, then with his tongue; and if he is not able to do so, then with his heart, and that is the weakest level of faith.